<div dir="ltr">I upgraded to 3.20 and had some issues with the Nouveau drivers. Switched to proprietary Nvidia drivers and it worked much better. I'm using a DisplayPort3 however.</div> <div class="gmail_quote"><div dir="ltr">On Thu, 2 Jun 2016 at 12:20 Usama Akkad <<a href="mailto:uahello@gmail.com">uahello@gmail.com</a>> wrote: </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello Thomas, For me sometimes the screen connected to HDMI is not recognized till I remove the cable and reinsert it after boot. Then I might need to press the key to activate external screen on my laptop. try "xrandr" command to get info about the recognized screens. Best wishes, Usama On 02-06-2016 18:16, Thomas SIMON wrote: > Hello all, > > I'm not sure if this is the right mailing list or if I should ask for > help somewhere else (I'm not sure it's a bug so far...). Basically, the > problem is simple, after upgrade of Ubuntu GNOME 16.04 with staging PPA, > my external screen was working (plugged in with HDMI), even after the > first restart. I went away and then switched off entirely my laptop, > when I came back, no way to get the external screen recognised by the > system (doesn't show on "Display" of system settings and doesn't show > with randr command). > > Then, well, I used ppa-purge, but that didn't change anything and tried > to plug in the screen with a VGA cable (and USB adaptor) and that still > wasn't recognised. Finally, I tested the screen with another laptop > (running Win 10) and that got the screen to work, so I'm pretty sure > it's an issue related to the upgrade to Gnome 3.20. > > Would anybody be able to advise please? > > Thanks a lot in advance, > > Thomas > -- Ubuntu-GNOME mailing list <a href="mailto:Ubuntu-GNOME@lists.ubuntu.com" target="_blank">Ubuntu-GNOME@lists.ubuntu.com</a> Modify settings or unsubscribe at: <a href="https://lists.ubuntu.com/mailman/listinfo/ubuntu-gnome" rel="noreferrer" target="_blank">https://lists.ubuntu.com/mailman/listinfo/ubuntu-gnome</a> </blockquote></div>